JOURNAL OF POROUS MATERIALS
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2025
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IF 3.2
Dai Xiaojun,Cheng Yan,Wei Qiang,Zhou Yasong
In the petrochemical industry, a significant method of achieving high-value usage of polycyclic aromatic hydrocarbons in light cycle oil is the moderate hydrocracking of these hydrocarbons into C 6 -C 8 chemical raw materials. In order to prepare NiW-S supported catalysts, the impregnation technique was used to modify the small-crystal Y zeolites with P. The catalytic performance of the catalysts was assessed using naphthalene as the model chemical. The physicochemical characteristics of the catalysts and P-modified Y zeolites were examined in relation to the impacts of P modification. The results show that the introduction of P has a negative effect on the structural characteristics and acidity of Y zeolite, and this negative effect increases with the increase of P content. The introduction of P reduces the reduction temperature of the active metal of the catalyst and improves the reducibility of the active metal of the catalyst. Adding appropriate P species enhances the active phase characteristics of the corresponding Ni-W-S supported catalysts while weakening the metal-support interactions of the corresponding Ni-W-S supported catalysts. However, too much P species has a negative effect on the active phase characteristics of the catalysts. Naphthalene conversion and C 6 -C 8 selectivity were shown to be significantly influenced by the synergistic catalysis of acid sites and metal sites of the catalysts. The catalyst based on 2% P modified Y zeolite exhibited the best selectivity of C 6 -C 8 compounds. The yield of C 6 -C 8 of 2% P modified Y zeolite-based catalyst increased by 22.34% when compared to the unmodified catalyst. It is anticipated to serve as a guide for the high-value use of polycyclic aromatic hydrocarbons in light cycle oil in petrochemical industry.
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高影响因子
JOURNAL OF POROUS MATERIALS
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2025
·
IF 3.2
Wang Ke,Shi Xiang,Yuan Hong
The utilization of biomass as a feedstock for aviation kerosene production serves to alleviate demand pressure on petroleum resources. In this work, commercial hydroxyapatite (HAP) was used as a support to fabricate a series of mono- and bimetallic Pt-Ni catalysts via impregnation. These catalysts were then evaluated for the decarboxylation of oleic acid under a non-hydrogen atmosphere. The XRD and TEM analyses revealed that the Pt metal particles were highly dispersed, whereas the Ni particles exhibited a tendency toward aggregation with increasing loading. Furthermore, Pt-Ni bimetallic particles exhibited aggregation with elevated Ni content. Combined NH 3 -TPD and Py-IR characterization indicated that the 1.5Pt2Ni/HAP bimetallic catalyst possessed appropriate acidity(5.18 cm 3 /g STP) and abundant Lewis acid sites, as evidenced by a Brønsted-to-Lewis ratio of 0.32. Catalytic results demonstrated that under CO 2 atmosphere at 340 °C and 18 bar for 6 h, the 1.5Pt2Ni/HAP catalyst achieved complete conversion of oleic acid and the yield of C 8 -C 17 alkanes reached as high as 85.0%.
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高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Run Liu,Yi Zhang,Yuanzhi Xu,Zhonghui Liu,Jinhang Chen,Kheng-Lim Goh,Yufei Zhang,Mingming Zheng
Diacylglycerol (DAG) is a functional lipid that is naturally present in vegetable oils in limited concentrations (1 %–5 %). This study proposed an enzymatic method to afford high-content-DAG vegetable oils via a reaction catalyzed by an immobilized lipase, PS@OMS-C 8 , using high-speed homogenization and molecular distillation. Results indicated that 48.6 % DAG was initially obtained through the enzymatic glycerolysis of rapeseed oil with glycerol, of which 90.2 % was sn -1,3-DAG. PS@OMS-C 8 maintained 35.5 % DAG content after 10 reuse cycles, confirming its catalytic stability; this was attributed to lipase immobilization on the ordered mesoporous silica that significantly improve the secondary protein structures, including α-helix and β-sheet, thereby strengthening the rigidity of PS@OMS-C 8 . In addition to producing DAG-enriched rapeseed oil, other edible oils with 39.4 %–50.2 % DAG content were obtained, as revealed via molecular docking simulation. This study offers new strategies for the sustainable synthesis of vegetable oils with a high content of functional lipids high-content functional lipids.
研究领域:
食品科学
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生物化学
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PubMed
高影响因子
FUEL
·
2020
·
IF 5.578
Hongyan Wang,Song Ma,Zhimao Zhou,Minjie Li,Hui Wang
The alkylation process of iso butane with butene is important in the petroleum industry. Ionic liquids (ILs) are considered as attractive alternative catalysts for iso butane alkylation besides strong liquid acids (H 2 SO 4 or HF) and solid superacids. In this study, ILs based on amides-aluminum chloride (AlCl 3 ) were synthesized and characterized, which exhibited both Lewis and Brønsted acidities. These deep eutectic ILs were found to be efficient catalysts for iso butane alkylation. The influences of the amide substrate, AlCl 3 /amide molar ratio, and metal additive on Lewis and Brønsted acidities were observed together with the synergetic effect of Lewis and Brønsted acid sites in the catalytic process. CuCl modified Urea-1.6AlCl 3 showed the best catalytic performance. The butene conversion was about 99.9% and C8 selectivity reached 57.6% under optimized reaction conditions (temperature of 15 °C, stirring rate of 1500 rpm, hydrocarbon feeding rate of 300 mL/h, iso butane/olefin molar ratio of 15:1, and reaction time of 15 min). In addition, Urea-1.6AlCl 3 -0.13CuCl could be recycled and reused for at least 20 times without obvious loss in catalytic activity.
研究领域:
化学工程
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石油化学
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高影响因子
ADVANCED MATERIALS
·
2013
·Vol. 25
·期 40
·5762-5766
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IF 14.829
Congcheng Fan,Arjan P. Zoombelt,Hao Jiang,Weifei Fu,Jiake Wu,Wentao Yuan,Yong Wang,Hanying Li,Hongzheng Chen,Zhenan Bao
Graphical Organic single-crystalline p-n junctions are grown from mixed solutions. First, C 60 crystals (n-type) form and, subsequently, C8-BTBT crystals (p-type) nucleate heterogeneously on the C 60 crystals. Both crystals continue to grow simultaneously into single-crystalline p-n junctions that exhibit ambipolar charge transport characteristics. This work provides a platform to study organic single-crystalline p-n junctions.
研究领域:
材料科学
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电子工程
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有机半导体
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PubMed
高影响因子
SYNTHETIC METALS
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2017
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IF 2.435
Yuan Zhao,Xiaoliang Liu,Lu Lyu,Lin Li,Wenjun Tan,Shitan Wang,Can Wang,Dongmei Niu,Haipeng Xie,Han Huang,Yongli Gao
Modification by ultra-thin fullerene (C 60 ) insertion layer of about 1 monolayer on the electronic structure and the film growth of 2,7-diocty[1]benzothieno-[3,2-b]benzothiophene (C8-BTBT) on silicon oxide (SiO 2 ) is investigated using ultraviolet photoelectron spectroscopy (UPS), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and X-ray diffraction (XRD). It is found that the ultra-thin C 60 insertion layer doesn’t induce an ambipolar charge transport characteristic but it indeed lifts up the energy levels of C8-BTBT, resulting in p-doping and hole accumulation at the semiconductor-dielectric interface. The charge transfer from trap states residing in the band gap of C8-BTBT to the lowest unoccupied molecular orbital (LUMO) of C 60 most likely leads to a decrease of threshold voltage for corresponding organic field effect transistors (OFETs) based on such a configuration. Band bending and decrease of the ionization potential (IP) are observed in the C8-BTBT film attributed to the increasing ordering of molecular orientation with the deposition of C8-BTBT. The HOMO downward shift is clearly bigger with the C 60 insertion layer than that without. A typical Volmer-Weber (VW) growth mode is detected due to the weaker van der Waals interaction between C8-BTBT and the underlying layer of C 60 /C8-BTBT than that between the C8-BTBT molecules. Compared to without C 60 interlayer, the molecular packing is a little more disordered at low coverages, resulting in more C8-BTBT molecules to lean away from the interface normal. The C8-BTBT film in such a structure phase has the HOMO closer to the E F than that at an almost perfectly vertically standing up configuration. Our results show that the introduction of C 60 insertion layer lifts up the HOMO of C8-BTBT and improves the energy level alignment at the interface.
研究领域:
材料科学
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物理化学
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半导体器件
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高影响因子
ENERGY & FUELS
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2021
·
IF 3.605
Meiqiu Hu,Xiaolong Liu,Hong Yuan,Jingye Ma
An in situ encapsulation process was used to prepare ordered worm-like mesoporous Pt@SAPO-11 catalysts with different Pt loadings. Transmission electron microscopy images showed that Pt nanoparticles encapsulated within the SAPO-11 support mesopores were uniformly distributed and highly dispersed and had a narrow particle size distribution of 2–7 nm. Scanning electron microscopy indicated that increasing the Pt loading from 0.6 to 1.6 wt % did not significantly change the crystalline morphology of the catalyst, although the crystallinity decreased slightly. The specific surface area and average pore diameter of the Pt@SAPO-11 were in the ranges of 72–116 m2/g and 8.1–9.5 nm, respectively, which are determined by the Brunauer–Emmett–Teller method and Barrett–Joyner–Halenda method, respectively. The NH3 thermal-programmed desorption established that increasing the Pt loading gradually decreased the total NH3 desorption and that a loading of 1.2 wt % produced the highest concentration of medium-strong acid sites (6.2 cm3/g STP). X-ray photoelectron spectroscopy and H2 temperature-programmed reduction showed that a Pt loading of 1.2 wt % gave the strongest interaction between Pt nanoparticles and the SAPO-11 support. The Pt@SAPO-11 catalysts were used for the preparation of C8–C17 alkanes by decarboxylation of oleic acid. Employing a reaction temperature of 340 °C, a CO2 atmosphere, a Pt loading on the catalyst of 1.2 wt %, and a reaction time of 4 h, 100% oleic acid conversion was obtained together with an 80% yield of C8–C17 alkanes.
研究领域:
催化化学
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材料科学
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高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Tiantian Zhang,Yi Zhang,Changyue Deng,Huaying Zhong,Tingting Gu,Kheng-Lim Goh,Zhongmu Han,Mingming Zheng,Yibin Zhou
L-ascorbyl palmitate (LAP) is the permitted antioxidant used in baby food, but its high commercial demand is suppressed by poor liposolubility. In this paper, a cleaner and more efficient method to synthesize the high-liposoluble and antioxidant unsaturated fatty acid ascorbyl esters (UFAAE) is proposed, based on the enzymatic catalysis using CaLB immobilized on the ordered mesoporous silicon (CaLB@OMS-C 8 ). The results indicated that the maximum catalytic efficiency (CE) in CaLB@OMS-C 8 could reach 20.8 M g −1 h −1 , thus facilitating the high conversions of 71.8%, 74.1% and 76.8% for L-ascorbyl oleate (LAO), L-ascorbyl linoleate (LAL) and L-ascorbic acid linolenic ester (LALN), respectively. The higher yield of LALN was explained by molecular docking technology as lipase CaLB presented a high binding affinity to linolenic acid (−18.8 kJ/mol) than those to oleic acid (−9.2 kJ/mol) and linoleic acid (−15.4 kJ/mol). By using unsaturated fatty acids as acyl donors, the synthesized UFAAE exhibited a lower melting point, better liposolubility and comparable antioxidant ability compared to LAP. This method to synthesize the high-soluble and antioxidant L-ascorbyl esters by the enzymatic esterification between L-ascorbic acid and unsaturated fatty acids shows great potential as a clean and efficient approach for future industrial production.
研究领域:
食品科学
·
生物化学
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高影响因子
METABOLIC ENGINEERING
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2020
·
IF 7.263
Xi Deng,Liuqing Chen,Mohan Hei,Tiangang Liu,Yan Feng,Guang-Yu Yang
Medium-chain fatty acids (C6–C10) have attracted much attention recently for their unique properties compared to their long-chain counterparts, including low melting points and relatively higher carbon conversion yield. Thioesterase enzymes , which can catalyze the hydrolysis of acyl-ACP (acyl carrier protein) to release free fatty acids (FAs), regulate both overall FA yields and acyl chain length distributions in bacterial and yeast fermentation cultures. These enzymes typically prefer longer chain substrates. Herein, seeking to increase bacterial production of MCFAs, we conducted structure-guided mutational screening of multiple residues in the substrate-binding pocket of the E. coli thioesterase enzyme ‘TesA. Confirming our hypothesis that enhancing substrate selectivity for medium-chain acyl substrates would promote overall MCFA production, we found that replacement of residues lining the bottom of the pocket with more hydrophobic residues strongly promoted the C8 substrate selectivity of ‘TesA. Specifically, two rounds of saturation mutagenesis led to the identification of the ‘TesA RD−2 variant that exhibited a 133-fold increase in selectivity for the C8-ACP substrate as compared to C16-ACP substrate. Moreover, the recombinant expression of this variant in an E. coli strain with a blocked β -oxidation pathway led to a 1030% increase in the in vivo octanoic acid (C8) production titer. When this strain was fermented in a 5-L fed-batch bioreactor , it produced 2.7 g/L of free C8 (45%, molar fraction) and 7.9 g/L of total free FAs, which is the highest-to-date free C8 titer to date reported using the E. coli type II fatty acid synthetic pathway. Thus, reshaping the substrate binding pocket of a bacterial thioesterase enzyme by manipulating the hydrophobicity of multiple residues altered the substrate selectivity and therefore fatty acid product distributions in cells. Our study demonstrates the relevance of this strategy for increasing titers of industrially attractive MCFAs as fermentation products.
研究领域:
生物化学
·
合成生物学
·
代谢工程
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PubMed
高影响因子
Small
·
2023
·
IF 13.3
Jianhui Zeng,Ting Liang,Jingjing Zhang,Daoqing Liu,Shiang Li,Xinhui Lu,Meng Han,Yimin Yao,Jian-Bin Xu,Rong Sun,Liejun Li
Attaining elevated thermal conductivity in organic materials stands as a coveted objective, particularly within electronic packaging, thermal interface materials, and organic matrix heat exchangers. These applications have reignited interest in researching thermally conductive organic materials. The understanding of thermal transport mechanisms in these organic materials is currently constrained. This study concentrates on N , N' -dioctyl-3,4,9,10-perylenedicarboximide (PTCDI-C 8 ), an organic conjugated crystal. A correlation between elevated thermal conductivity and augmented Young's modulus is substantiated through meticulous experimentation. Achievement via employing the physical vapor transport method, capitalizing on the robust C═C covalent linkages running through the organic matrix chain, bolstered by π–π stacking and noncovalent affiliations that intertwine the chains. The coexistence of these dynamic interactions, alongside the perpendicular alignment of PTCDI-C 8 molecules, is confirmed through structural analysis. PTCDI-C 8 thin film exhibits an out-of-plane thermal conductivity of 3.1 ± 0.1 W m −1 K −1 , as determined by time-domain thermoreflectance. This outpaces conventional organic materials by an order of magnitude. Nanoindentation tests and molecular dynamics simulations elucidate how molecular orientation and intermolecular forces within PTCDI-C 8 molecules drive the film's high Young's modulus, contributing to its elevated thermal conductivity. This study's progress offers theoretical guidance for designing high thermal conductivity organic materials, expanding their applications and performance potential.
研究领域:
材料科学
·
热传导研究
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DOI
PubMed
高影响因子
FUEL
·
2017
·
IF 4.601
Honghua Zhang,Ruixia Liu,Zhiqiang Yang,Feng Huo,Ruirui Zhang,Zihang Li,Suojiang Zhang,Yanji Wang
In this work, the alkylation of isobutane and butene, catalyzed by sulfuric acid in the presence of the fluoride–containing ionic liquids [Bmim][PF 6 ] and [Bmim][SbF 6 ], was investigated. The use of the binary mixture catalysts brought to a higher C 8 selectivity and longer catalyst lifetime, compared with the results obtained when working with sulfuric acid only. This was attributed to the formation of new species when [Bmim][PF 6 ] or [Bmim][SbF 6 ] are added to sulfuric acid. The acidolysis of [Bmim][PF 6 ] and [Bmim][SbF 6 ] was accompanied by the release of hydrogen fluoride (HF) and the decomposition of anions to [PF 6−x−2y (HSO 4 ) x (SO 4 ) y ] − and [SbF 6−x−2y (HSO 4 ) x (SO 4 ) y ] − , respectively. The presence of these new species after acidolysis was measured and confirmed by ion chromatography, 1 H–Nuclear Magnetic Resonance (NMR), 19 F–NMR and 31 P–NMR. The production of HF and the complexation of anions and carbenium ions both play an important role in stabilizing the carbenium ion and improving the catalytic performance.
研究领域:
化学工程
·
催化科学
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高影响因子
JOURNAL OF POROUS MATERIALS
·
2025
·
IF 3.2
Ding Yunlong,Wang Jiayin,Zhang Yanting,Pu Yongzhi,Hou Nan,Li Ning,Song Jinrui,Liang Yaning,Li Xiaofeng
This study aimed to synthesize a novel mesoporous template agent, KHBA, using 3-glycidoxypropyltrimethoxysilane (KH-560) and butylamine as raw materials, and to explore its application in the synthesis of ZSM-5 zeolites with nanocrystal aggregates. The physical and chemical properties of the synthesized ZSM-5 zeolites were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TG), and low-temperature N 2 adsorption–desorption The results showed that the introduction of KHBA effectively inhibited excessive crystal growth and promoted the formation of nanocrystal aggregates with a mesoporous structure. In the synthesis system with a KHBA-to-Al 2 O 3 molar ratio ranging from 1.6 to 4.8, the external surface area and mesoporous volume of the samples increased with increasing KHBA content. The sample synthesized with a KHBA-to-Al 2 O 3 molar ratio of 4.8 exhibited the highest external surface area (250.43 m 2 /g) and mesoporous volume (0.24 cm 3 /g). In the catalytic performance test for C8 aromatic hydrocarbon isomerization, the catalyst prepared with a KHBA-to-Al 2 O 3 molar ratio of 4.8 demonstrated the best performance, with isomerization activity of 23.79%, ethylbenzene conversion of 88.94%, and xylene loss of 3.42%. These findings highlight the potential of KHBA as an effective template agent for the synthesis of high-performance ZSM-5 zeolites in catalytic applications.
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高影响因子
危险品化学品经营许可证（带存储）